So far I've counted at least 8 different part #'s for the 07-08 nav. units. But seems to me, they are all the same, except for the fact that some play DVD's and some don't. The only difference I can tell is that some are AVAL.'s, Tahoe's, and Yukon's, and some are for our trucks. Except so far in my testing, they seem to be interchangeable. What's the deal?... why so many part #'s?

So far I've counted at least 8 different part #'s for the 07-08 nav. units. But seems to me, they are all the same, except for the fact that some play DVD's and some don't. The only difference I can tell is that some are AVAL.'s, Tahoe's, and Yukon's, and some are for our trucks. Except so far in my testing, they seem to be interchangeable. What's the deal?... why so many part #'s?


im wondering that to.....i want to add it to my lmm when i get it